weiwang added a comment. We've seen a huge memory footprint from AST Reader/Writer in a single CU with module enabled. Upon further analysis, the content of vector `DeclsToCheckForDeferredDiags` seems mostly redundant. In one case, 1,734,387,685 out of 1,734,404,000 elements are the same. While this may indicate something wrong with the source itself, it also suggests that compiler would be better to perform deduplication on this type of Decl ID.
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